CN110707921B - Control method, control device, household electrical appliance and computer readable storage medium - Google Patents
Control method, control device, household electrical appliance and computer readable storage medium Download PDFInfo
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- CN110707921B CN110707921B CN201911204464.3A CN201911204464A CN110707921B CN 110707921 B CN110707921 B CN 110707921B CN 201911204464 A CN201911204464 A CN 201911204464A CN 110707921 B CN110707921 B CN 110707921B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a control method, a control device, household electrical appliance equipment and a computer readable storage medium, wherein the control method is suitable for a control circuit, a Power Factor Correction (PFC) circuit is arranged in the control circuit, a switching device is arranged in the PFC circuit, and the control method comprises the following steps: in the first type of time period, controlling the switching device to continuously input a variable-frequency high-frequency pulse signal so as to improve the bus voltage provided by the control circuit; and controlling the input of a plurality of specified pulse signals to the switching device to reduce the bus voltage provided by the control circuit within the specified duration of the second type of period. According to the technical scheme of the invention, the variable-frequency high-frequency pulse signal is continuously input to the switching device in different time periods, and the bus voltage provided by the control circuit is changed, so that the switching device in the PFC circuit has power loss in a part of time, the loss of the switching power of the PFC circuit can be reduced, and the working efficiency of the PFC circuit is improved.
Description
Technical Field
The present invention relates to the field of control technologies, and in particular, to a control method, a control apparatus, a home appliance, and a computer-readable storage medium.
Background
In the current inverter air-conditioning market, in order to improve the operating energy efficiency of a load, a rectifier, an inductor, a PFC (Power Factor Correction) module, an electrolytic capacitor and an inverter are generally used to form a control circuit of a motor (load).
In the related art, in order to reduce the power consumption of the BOOST PFC and the power consumption of the rectifier, the totem-pole PFC module is used to replace the BOOST PFC and the rectifier, but the efficiency and the harmonic performance of the control circuit still need to be improved.
Moreover, any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily known to a person of ordinary skill in the art, and any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily widely known or forms part of common general knowledge in the field.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
In view of the above, an object of the present invention is to provide a control method.
Another object of the present invention is to provide a control device.
It is yet another object of the present invention to provide a home appliance.
It is yet another object of the present invention to provide a computer-readable storage medium.
In order to achieve the above object, a technical solution of a first aspect of the present invention provides a control method, which is applied to a control circuit, where the control circuit is provided with a PFC circuit, and the PFC circuit is provided with a switching device, and the control method includes: in the first type of time period, controlling the switching device to continuously input a variable-frequency high-frequency pulse signal so as to improve the bus voltage provided by the control circuit; and controlling the input of a plurality of specified pulse signals to the switching device to reduce the bus voltage provided by the control circuit within the specified duration of the second type of period.
In the technical scheme, the bus voltage provided by the control circuit is improved by controlling the continuous input of the variable-frequency high-frequency pulse signals to the switching device in the first type of time period so as to ensure that the load reliably operates, and the input of a plurality of specified pulse signals to the switching device is controlled in the specified time period in the second type of time period so as to reduce the bus voltage provided by the control circuit, further reduce the switching loss and the loss of the bus voltage, and facilitate the improvement of the harmonic performance and the efficiency of the control circuit.
In the above technical solution, the method further comprises: acquiring the load driven by the control circuit; and determining the first type period and/or the second type period according to the load amount.
In the technical scheme, the first type time interval and/or the second type time interval are determined according to the load amount by acquiring the load amount driven by the control circuit, namely the time interval of the bus voltage rising is determined according to the load amount, namely the first type time interval, and meanwhile, the time interval of the bus voltage lowering is determined according to the load amount, namely the second type time interval, the bus voltage is not required to be monitored in real time, the working state of a switching device of the PFC circuit is determined more accurately only by recording the power supply duration of the bus voltage, and further the reliability and the stability of the control circuit are improved.
In the above technical solution, the method further comprises: acquiring the load driven by the control circuit; and determining at least one parameter of the frequency, the duty ratio and the pulse width of the high-frequency pulse signal according to the load amount.
In the technical scheme, the load quantity driven by the control circuit is obtained, at least one parameter of the frequency, the duty ratio and the pulse width of the high-frequency pulse signal is determined according to the load quantity, the speed and the reliability of the bus voltage increase are adjusted by adjusting the parameter of the high-frequency pulse signal, and the harmonic signal of the control circuit is reduced as much as possible.
In the above technical solution, a time difference between the ending time of the first-type period and the starting time of the second-type period is less than or equal to a first preset duration, and a time difference between the starting time of the first-type period and the ending time of the second-type period is less than or equal to a second preset duration.
In the technical scheme, the time difference between the ending time of the first type time interval and the starting time of the second type time interval is set to be less than or equal to a first preset time length, and the time difference between the starting time of the first type time interval and the ending time of the second type time interval is set to be less than or equal to a second preset time length, so that the time length for the bus voltage to rise is greater than the time length for the bus voltage to fall, and the possibility of load power failure is reduced.
In the above technical solution, the first-type time interval and the second-type time interval are alternately arranged and do not overlap.
In the technical scheme, the first-class time interval and the second-class time interval are alternately arranged and are not coincident, so that the bus voltage can be ensured to meet the load operation requirement, the switching loss, the bus voltage loss and harmonic waves can be reduced, and in addition, the power factor and the load operation reliability can be improved.
In the above technical solution, the method further comprises: determining a third bus voltage given value according to the load; acquiring the bus voltage when the control circuit supplies power; judging whether the bus voltage is greater than or equal to the third bus voltage given value or not; and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling the power tube to cut off or synchronously rectify so as to enable the PFC circuit to be in an intermittent state.
In the technical scheme, the third bus voltage given value is determined according to the load, namely the maximum bus voltage value determined by referring to withstand voltage values of an inverter and a rectifier in the control circuit, and the cutoff or synchronous rectification of the power tube is controlled by judging that the bus voltage is greater than or equal to the third bus voltage given value, so that the PFC circuit is in an intermittent state, and when the bus voltage exceeds the third bus voltage given value, the PFC circuit can be controlled to stop working as soon as possible, so that the fault rate and the device damage of the control circuit are reduced as much as possible.
In the above technical solution, the PFC circuit is a boost PFC circuit, a power conversion device is disposed between the boost PFC circuit and a power grid system to which an ac signal is input, and a variable-frequency high-frequency pulse signal is continuously input to the switching device in a first-class period to increase a bus voltage provided by the control circuit, and the method specifically includes: and controlling the switching device of the boost PFC circuit to continuously input the variable-frequency high-frequency pulse signal in a first type period so as to increase the bus voltage provided by the control circuit, wherein the end time of the first type period is the start time of the second type period.
In the technical scheme, the variable-frequency high-frequency pulse signal is controlled to be continuously input to the switching device of the boost PFC circuit in the first class time period so as to control the bus voltage to rise to the first bus voltage given value, and the bus voltage is increased in time to meet the minimum requirement of load operation, so that the reliability of the load operation and the bus voltage is further improved.
In the above technical solution, the PFC circuit is a boost PFC circuit, a power conversion device is disposed between the boost PFC circuit and a power grid system to which an ac signal is input, and a plurality of specified pulse signals are controlled to be input to the switching device within a specified duration of a second type of time period, so as to reduce a bus voltage provided by the control circuit, and the method specifically includes: and controlling to input a plurality of specified pulse signals to a switching device of the boost PFC circuit within a specified duration of a second type period to reduce the bus voltage provided by the control circuit, wherein the end time of the second type period is the start time of the first type period.
In the technical scheme, a plurality of specified pulse signals are input to the switching device of the boost PFC circuit so as to reduce the bus voltage provided by the control circuit, and the bus voltage loss, the switching loss and the harmonic wave are further reduced.
In the above technical solution, the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, the switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse-biased diode, the totem-pole PFC circuit is connected to a power grid system of the ac signal, and in a first-class period, the totem-pole PFC circuit controls continuous input of a variable-frequency high-frequency pulse signal to the switching device to increase a bus voltage provided by the control circuit, and specifically includes: and controlling the switching device of the totem-pole PFC circuit to continuously input the variable-frequency high-frequency pulse signal in a first class period so as to increase the bus voltage provided by the control circuit, wherein the ending time of the first class period is the starting time of the second class period.
In the technical scheme, the variable-frequency high-frequency pulse signal is controlled to be continuously input to the switching device of the totem-pole PFC circuit in the first class time period so as to control the bus voltage to rise to the given value of the first bus voltage, and the bus voltage is increased in time to meet the minimum requirement of load operation, so that the reliability of the load operation and the bus voltage is further improved.
In the above technical solution, the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, the switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse-biased diode, the totem-pole PFC circuit is connected to a power grid system of the ac signal, and a plurality of specified pulse signals are controlled to be input to the switching device within a specified duration of a second type of time period to reduce a bus voltage provided by the control circuit, and specifically includes: and controlling to input a plurality of specified pulse signals to a switching device of the totem-column PFC circuit within a specified duration of a second type period so as to reduce the bus voltage provided by the control circuit, wherein the ending time of the second type period is the starting time of the first type period.
In the technical scheme, a plurality of specified pulse signals are input to a switching device of the totem-pole PFC circuit to reduce the bus voltage provided by the control circuit, so that the bus voltage loss, the switching loss and the harmonic wave are further reduced.
In the above technical solution, the method further comprises: detecting an operating parameter of a load and resolving the operating parameter to determine a back electromotive force and a rotation speed of the load; and determining the load according to the back electromotive force and the rotating speed.
According to the technical scheme, the back electromotive force and the rotating speed of the load are determined by detecting the operating parameters of the load and analyzing the operating parameters, and finally the load capacity is determined according to the back electromotive force and the rotating speed, so that the electric quantity and the bus voltage value required by the load operation are comprehensively determined, and the reliability of the load operation is ensured.
An aspect of the second aspect of the present invention provides a control apparatus comprising a processor which, when executing a computer program, implements a control method as defined in any one of the above aspects.
Therefore, the technical effect defined by any one technical scheme is achieved, and details are not repeated herein.
A third aspect of the present invention provides a home appliance, including: a load; a control device as defined in any of the above claims; the control circuit is controlled by the control device and provided with a PFC circuit, and the PFC circuit comprises at least one switching device which is configured to control a power supply signal to supply power to a load. The processor of the control device implements the control method defined in any one of the above claims when executing the computer program.
Therefore, the technical effect of the control method defined by any one of the above technical schemes is achieved, and details are not repeated herein.
According to the third aspect of the present invention, the household electrical appliance optionally comprises at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector and a computer host.
An aspect of the fourth aspect of the present invention provides a computer-readable storage medium, where a computer program is executed by a processor to implement the steps of the control method defined in any one of the above technical solutions, so that the technical effects of the control method defined in any one of the above technical solutions are achieved, and details are not repeated here.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a flow diagram of a control method according to an embodiment of the invention;
fig. 2 shows a circuit configuration diagram of a BOOST PFC according to a control method of an embodiment of the present invention;
fig. 3 shows a circuit configuration diagram of a totem-column type PFC according to a control method of an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a circuit of a control method according to an embodiment of the invention;
FIG. 5 shows a flow diagram of a control method according to an embodiment of the invention;
FIG. 6 shows a voltage-current waveform diagram of a control method according to an embodiment of the invention;
FIG. 7 shows a schematic block diagram of a control device according to an embodiment of the invention;
fig. 8 shows a schematic block diagram of a home device according to an embodiment of the present invention;
FIG. 9 shows a schematic block diagram of a computer-readable storage medium according to an embodiment of the invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Some embodiments according to the invention are described below with reference to fig. 1 to 9.
Example one
As shown in fig. 1, a flow chart of a control method according to an embodiment of the invention is shown, which includes:
and step S102, controlling the switching device to continuously input a variable-frequency high-frequency pulse signal in the first type time period so as to improve the bus voltage provided by the control circuit.
And step S104, controlling to input a plurality of specified pulse signals to the switching device within the specified duration of the second type of time period so as to reduce the bus voltage provided by the control circuit.
In the technical scheme, the bus voltage provided by the control circuit is improved by controlling the continuous input of the variable-frequency high-frequency pulse signals to the switching device in the first type of time period so as to ensure that the load reliably operates, and the input of a plurality of specified pulse signals to the switching device is controlled in the specified time period in the second type of time period so as to reduce the bus voltage provided by the control circuit, further reduce the switching loss and the loss of the bus voltage, and facilitate the improvement of the harmonic performance and the efficiency of the control circuit.
In the above technical solution, the method further comprises: acquiring the load driven by the control circuit; and determining the first type period and/or the second type period according to the load amount.
In the technical scheme, the first type time interval and/or the second type time interval are determined according to the load amount by acquiring the load amount driven by the control circuit, namely the time interval of the bus voltage rising is determined according to the load amount, namely the first type time interval, and meanwhile, the time interval of the bus voltage lowering is determined according to the load amount, namely the second type time interval, the bus voltage is not required to be monitored in real time, the working state of a switching device of the PFC circuit is determined more accurately only by recording the power supply duration of the bus voltage, and further the reliability and the stability of the control circuit are improved.
In the above technical solution, the method further comprises: acquiring the load driven by the control circuit; and determining at least one parameter of the frequency, the duty ratio and the pulse width of the high-frequency pulse signal according to the load amount.
In the technical scheme, the load quantity driven by the control circuit is obtained, at least one parameter of the frequency, the duty ratio and the pulse width of the high-frequency pulse signal is determined according to the load quantity, the speed and the reliability of the bus voltage increase are adjusted by adjusting the parameter of the high-frequency pulse signal, and the harmonic signal of the control circuit is reduced as much as possible.
In the above technical solution, a time difference between the ending time of the first-type period and the starting time of the second-type period is less than or equal to a first preset duration, and a time difference between the starting time of the first-type period and the ending time of the second-type period is less than or equal to a second preset duration.
In the technical scheme, the time difference between the ending time of the first type time interval and the starting time of the second type time interval is set to be less than or equal to a first preset time length, and the time difference between the starting time of the first type time interval and the ending time of the second type time interval is set to be less than or equal to a second preset time length, so that the time length for the bus voltage to rise is greater than the time length for the bus voltage to fall, and the possibility of load power failure is reduced.
In the above technical solution, the first-type time interval and the second-type time interval are alternately arranged and do not overlap.
In the technical scheme, the first-class time interval and the second-class time interval are alternately arranged and are not coincident, so that the bus voltage can be ensured to meet the load operation requirement, the switching loss, the bus voltage loss and harmonic waves can be reduced, and in addition, the power factor and the load operation reliability can be improved.
In the above technical solution, the method further comprises: determining a third bus voltage given value according to the load; acquiring the bus voltage when the control circuit supplies power; judging whether the bus voltage is greater than or equal to the third bus voltage given value or not; and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling the power tube to cut off or synchronously rectify so as to enable the PFC circuit to be in an intermittent state.
In the technical scheme, the third bus voltage given value is determined according to the load, namely the maximum bus voltage value determined by referring to withstand voltage values of an inverter and a rectifier in the control circuit, and the cutoff or synchronous rectification of the power tube is controlled by judging that the bus voltage is greater than or equal to the third bus voltage given value, so that the PFC circuit is in an intermittent state, and when the bus voltage exceeds the third bus voltage given value, the PFC circuit can be controlled to stop working as soon as possible, so that the fault rate and the device damage of the control circuit are reduced as much as possible.
In the above technical solution, the PFC circuit is a boost PFC circuit, a power conversion device is disposed between the boost PFC circuit and a power grid system to which an ac signal is input, and a variable-frequency high-frequency pulse signal is continuously input to the switching device in a first-class period to increase a bus voltage provided by the control circuit, and the method specifically includes: and controlling the switching device of the boost PFC circuit to continuously input the variable-frequency high-frequency pulse signal in a first type period so as to increase the bus voltage provided by the control circuit, wherein the end time of the first type period is the start time of the second type period.
In the technical scheme, the variable-frequency high-frequency pulse signal is controlled to be continuously input to the switching device of the boost PFC circuit in the first class time period so as to control the bus voltage to rise to the first bus voltage given value, and the bus voltage is increased in time to meet the minimum requirement of load operation, so that the reliability of the load operation and the bus voltage is further improved.
In the above technical solution, the PFC circuit is a boost PFC circuit, a power conversion device is disposed between the boost PFC circuit and a power grid system to which an ac signal is input, and a plurality of specified pulse signals are controlled to be input to the switching device within a specified duration of a second type of time period, so as to reduce a bus voltage provided by the control circuit, and the method specifically includes: and controlling to input a plurality of specified pulse signals to a switching device of the boost PFC circuit within a specified duration of a second type period to reduce the bus voltage provided by the control circuit, wherein the end time of the second type period is the start time of the first type period.
In the technical scheme, a plurality of specified pulse signals are input to the switching device of the boost PFC circuit so as to reduce the bus voltage provided by the control circuit, and the bus voltage loss, the switching loss and the harmonic wave are further reduced.
In the above technical solution, the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, the switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse-biased diode, the totem-pole PFC circuit is connected to a power grid system of the ac signal, and in a first-class period, the totem-pole PFC circuit controls continuous input of a variable-frequency high-frequency pulse signal to the switching device to increase a bus voltage provided by the control circuit, and specifically includes: and controlling the switching device of the totem-pole PFC circuit to continuously input the variable-frequency high-frequency pulse signal in a first class period so as to increase the bus voltage provided by the control circuit, wherein the ending time of the first class period is the starting time of the second class period.
In the technical scheme, the variable-frequency high-frequency pulse signal is controlled to be continuously input to the switching device of the totem-pole PFC circuit in the first class time period so as to control the bus voltage to rise to the given value of the first bus voltage, and the bus voltage is increased in time to meet the minimum requirement of load operation, so that the reliability of the load operation and the bus voltage is further improved.
In the above technical solution, the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, the switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse-biased diode, the totem-pole PFC circuit is connected to a power grid system of the ac signal, and a plurality of specified pulse signals are controlled to be input to the switching device within a specified duration of a second type of time period to reduce a bus voltage provided by the control circuit, and specifically includes: and controlling to input a plurality of specified pulse signals to a switching device of the totem-column PFC circuit within a specified duration of a second type period so as to reduce the bus voltage provided by the control circuit, wherein the ending time of the second type period is the starting time of the first type period.
In the technical scheme, a plurality of specified pulse signals are input to a switching device of the totem-pole PFC circuit to reduce the bus voltage provided by the control circuit, so that the bus voltage loss, the switching loss and the harmonic wave are further reduced.
In the above technical solution, the method further comprises: detecting an operating parameter of a load and resolving the operating parameter to determine a back electromotive force and a rotation speed of the load; and determining the load according to the back electromotive force and the rotating speed.
According to the technical scheme, the back electromotive force and the rotating speed of the load are determined by detecting the operating parameters of the load and analyzing the operating parameters, and finally the load capacity is determined according to the back electromotive force and the rotating speed, so that the electric quantity and the bus voltage value required by the load operation are comprehensively determined, and the reliability of the load operation is ensured.
Example two
As shown in fig. 2, a circuit structure diagram of a BOOST PFC according to a control method of an embodiment of the present invention is shown, including:
alternating current power supply AC, a diode D1, a diode D2, a diode D3, a diode D4, an inductance coil L, a power tube Q0, a capacitor C, an inverter bridge and a compressor.
Wherein, the PFC circuit includes: inductor L, diode D1, diode D2, diode D3, and diode D4. When the switch device is turned on, the AC signal AC is sent to the PFC circuit, and a pulse signal is output, wherein C is an electrolytic capacitor.
EXAMPLE III
As shown in fig. 3, a circuit configuration diagram of a totem-column PFC showing a control method according to an embodiment of the present invention includes:
the power supply comprises an alternating current power supply AC, an inductance coil L, a diode D1, a diode D2, a diode D3 and a diode D4 which are respectively reverse-biased diodes of a power tube Q1, a power tube Q2, a power tube Q3 and a power tube Q4, and further comprises a capacitor C, an inverter bridge and a compressor, wherein the compressor is an embodiment of a load.
Wherein, the PFC circuit includes: the inductive coil L, the diode D1, the diode D2, the diode D3, the diode D4, the power tube Q1, the power tube Q2, the power tube Q3, the power tube Q4 and the totem-pole PFC circuit can carry out synchronous rectification.
Example four
As shown in fig. 4, a schematic diagram of a circuit of a control method according to an embodiment of the present invention is shown, including: the device comprises an alternating current power supply AC, a current detection unit, a PFC circuit, a capacitor C, a load, an alternating current voltage detection unit, a driving unit, a control unit and a bus voltage detection unit.
The first switching device Q1, the second switching device Q2, the third switching device Q3 and the fourth switching device Q4 are controlled by a Control Unit, and in addition, the ac voltage detection Unit, the bus voltage detection Unit and the current detection Unit also send detection signals to the Control Unit, wherein the Control Unit may be one of a Micro-programmed Control Unit (MCU), a Central Processing Unit (CPU), a Digital Signal Processor (DSP), and an embedded device, but is not limited thereto.
EXAMPLE five
As shown in fig. 5, a flow chart of a control method according to an embodiment of the invention is shown, which includes:
step S502, bus voltage detection and alternating voltage detection.
Step S504, determining the current operating state, if the current circuit state is determined to be the variable high-frequency operating state, continuing to execute step S508, and if the current circuit state is determined to be the multi-pulse partial switch state, continuing to execute step S506.
And step S506, judging whether the opening time length is greater than a given value t2, returning to the step S506 if the opening time length is greater than the given value t2, and continuing to execute the step S510 if the opening time length is less than or equal to the given value t 2.
And step S508, judging whether the opening time length is greater than a given value t1, if so, executing step S512, and if not, executing step S508.
Step S510, switching the PFC to a variable high frequency operating state at a zero crossing point of the ac voltage.
Step S512, switching the PFC to a multi-pulse partial switch state.
EXAMPLE six
As shown in fig. 6, a voltage-current waveform diagram illustrating a control method according to an embodiment of the present invention includes:
vertical axis voltage, horizontal axis state, full period high frequency state, multi-pulse partial switch state, zero crossing point, variable frequency high frequency signal, multi-pulse drive signal, bus voltage, input voltage and input current.
As shown in fig. 6, when it is determined that the time when the bus voltage needs to be increased is T1, the bus voltage falls to the first bus voltage threshold, and in order to prevent the voltage from continuously falling to cause power failure, at the zero crossing point, that is, at time T1, the switching device is controlled to operate to time T2 in a full-cycle high-frequency switching state, and when the voltage value of the second bus voltage threshold is reached, a plurality of pulse signals are input to the switching device until the time T3 is reached, and in the time period T2 to T3 when the plurality of pulse signals are input, the bus voltage is decreased, so that the operating time of the switching device is maximally reduced, thereby ensuring the reliable operation of the load, reducing the switching loss, and improving the operating efficiency of the circuit.
EXAMPLE seven
As shown in fig. 7, the embodiment of the present invention further discloses a control apparatus 700, where the control apparatus 700 includes a processor 702, and when the processor 702 executes a computer program, the control method according to any one of the first embodiment or the second embodiment is implemented. Therefore, the technical effects of any of the above embodiments are achieved, and are not described herein again.
The Control device 700 includes at least one logic computing device selected from a Micro-programmed Control Unit (MCU), a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a single chip Microcomputer (MCU), and an embedded device.
Example eight
As shown in fig. 8, an embodiment of the present invention further provides a home appliance 800, including: a load; the control device 700 as defined in any one of the embodiments; the control circuit is controlled by the control device and provided with a PFC circuit, and the PFC circuit comprises at least one switching device which is configured to control a power supply signal to supply power to a load.
The processor of the control device 700, when executing the computer program, implements the steps of the control method according to any of the embodiments of the present invention. Therefore, the technical effects of the control method of any of the above embodiments are not described herein. Optionally, the home appliance 800 includes at least one of an air conditioner, a refrigerator, a fan, a hood, a cleaner, and a computer mainframe.
Example nine
As shown in fig. 9, an embodiment of the present invention further provides a computer-readable storage medium 900, where a computer program 902 is stored in the computer-readable storage medium 900, and when executed by a processor, the computer program 902 implements the steps of the control method disclosed in any of the above embodiments, so that the technical effects of the control method in any of the above embodiments are achieved, and details are not repeated herein.
In this embodiment, the computer program 902, when executed by a processor, implements the steps of:
in the first type of time period, controlling the switching device to continuously input a variable-frequency high-frequency pulse signal so as to improve the bus voltage provided by the control circuit; and controlling the input of a plurality of specified pulse signals to the switching device to reduce the bus voltage provided by the control circuit within the specified duration of the second type of period.
In the technical scheme, the bus voltage provided by the control circuit is improved by controlling the continuous input of the variable-frequency high-frequency pulse signals to the switching device in the first type of time period so as to ensure that the load reliably operates, and the input of a plurality of specified pulse signals to the switching device is controlled in the specified time period in the second type of time period so as to reduce the bus voltage provided by the control circuit, further reduce the switching loss and the loss of the bus voltage, and facilitate the improvement of the harmonic performance and the efficiency of the control circuit.
In the above technical solution, the method further comprises: acquiring the load driven by the control circuit; and determining the first type period and/or the second type period according to the load amount.
In the technical scheme, the first type time interval and/or the second type time interval are determined according to the load amount by acquiring the load amount driven by the control circuit, namely the time interval of the bus voltage rising is determined according to the load amount, namely the first type time interval, and meanwhile, the time interval of the bus voltage lowering is determined according to the load amount, namely the second type time interval, the bus voltage is not required to be monitored in real time, the working state of a switching device of the PFC circuit is determined more accurately only by recording the power supply duration of the bus voltage, and further the reliability and the stability of the control circuit are improved.
In the above technical solution, the method further comprises: acquiring the load driven by the control circuit; and determining at least one parameter of the frequency, the duty ratio and the pulse width of the high-frequency pulse signal according to the load amount.
In the technical scheme, the load quantity driven by the control circuit is obtained, at least one parameter of the frequency, the duty ratio and the pulse width of the high-frequency pulse signal is determined according to the load quantity, the speed and the reliability of the bus voltage increase are adjusted by adjusting the parameter of the high-frequency pulse signal, and the harmonic signal of the control circuit is reduced as much as possible.
In the above technical solution, a time difference between the ending time of the first-type period and the starting time of the second-type period is less than or equal to a first preset duration, and a time difference between the starting time of the first-type period and the ending time of the second-type period is less than or equal to a second preset duration.
In the technical scheme, the time difference between the ending time of the first type time interval and the starting time of the second type time interval is set to be less than or equal to a first preset time length, and the time difference between the starting time of the first type time interval and the ending time of the second type time interval is set to be less than or equal to a second preset time length, so that the time length for the bus voltage to rise is greater than the time length for the bus voltage to fall, and the possibility of load power failure is reduced.
In the above technical solution, the first-type time interval and the second-type time interval are alternately arranged and do not overlap.
In the technical scheme, the first-class time interval and the second-class time interval are alternately arranged and are not coincident, so that the bus voltage can be ensured to meet the load operation requirement, the switching loss, the bus voltage loss and harmonic waves can be reduced, and in addition, the power factor and the load operation reliability can be improved.
In the above technical solution, the method further comprises: determining a third bus voltage given value according to the load; acquiring the bus voltage when the control circuit supplies power; judging whether the bus voltage is greater than or equal to the third bus voltage given value or not; and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling the power tube to cut off or synchronously rectify so as to enable the PFC circuit to be in an intermittent state.
In the technical scheme, the third bus voltage given value is determined according to the load, namely the maximum bus voltage value determined by referring to withstand voltage values of an inverter and a rectifier in the control circuit, and the cutoff or synchronous rectification of the power tube is controlled by judging that the bus voltage is greater than or equal to the third bus voltage given value, so that the PFC circuit is in an intermittent state, and when the bus voltage exceeds the third bus voltage given value, the PFC circuit can be controlled to stop working as soon as possible, so that the fault rate and the device damage of the control circuit are reduced as much as possible.
In the above technical solution, the PFC circuit is a boost PFC circuit, a power conversion device is disposed between the boost PFC circuit and a power grid system to which an ac signal is input, and a variable-frequency high-frequency pulse signal is continuously input to the switching device in a first-class period to increase a bus voltage provided by the control circuit, and the method specifically includes: and controlling the switching device of the boost PFC circuit to continuously input the variable-frequency high-frequency pulse signal in a first type period so as to increase the bus voltage provided by the control circuit, wherein the end time of the first type period is the start time of the second type period.
In the technical scheme, the variable-frequency high-frequency pulse signal is controlled to be continuously input to the switching device of the boost PFC circuit in the first class time period so as to control the bus voltage to rise to the first bus voltage given value, and the bus voltage is increased in time to meet the minimum requirement of load operation, so that the reliability of the load operation and the bus voltage is further improved.
In the above technical solution, the PFC circuit is a boost PFC circuit, a power conversion device is disposed between the boost PFC circuit and a power grid system to which an ac signal is input, and a plurality of specified pulse signals are controlled to be input to the switching device within a specified duration of a second type of time period, so as to reduce a bus voltage provided by the control circuit, and the method specifically includes: and controlling to input a plurality of specified pulse signals to a switching device of the boost PFC circuit within a specified duration of a second type period to reduce the bus voltage provided by the control circuit, wherein the end time of the second type period is the start time of the first type period.
In the technical scheme, a plurality of specified pulse signals are input to the switching device of the boost PFC circuit so as to reduce the bus voltage provided by the control circuit, and the bus voltage loss, the switching loss and the harmonic wave are further reduced.
In the above technical solution, the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, the switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse-biased diode, the totem-pole PFC circuit is connected to a power grid system of the ac signal, and in a first-class period, the totem-pole PFC circuit controls continuous input of a variable-frequency high-frequency pulse signal to the switching device to increase a bus voltage provided by the control circuit, and specifically includes: and controlling the switching device of the totem-pole PFC circuit to continuously input the variable-frequency high-frequency pulse signal in a first class period so as to increase the bus voltage provided by the control circuit, wherein the ending time of the first class period is the starting time of the second class period.
In the technical scheme, the variable-frequency high-frequency pulse signal is controlled to be continuously input to the switching device of the totem-pole PFC circuit in the first class time period so as to control the bus voltage to rise to the given value of the first bus voltage, and the bus voltage is increased in time to meet the minimum requirement of load operation, so that the reliability of the load operation and the bus voltage is further improved.
In the above technical solution, the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, the switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse-biased diode, the totem-pole PFC circuit is connected to a power grid system of the ac signal, and a plurality of specified pulse signals are controlled to be input to the switching device within a specified duration of a second type of time period to reduce a bus voltage provided by the control circuit, and specifically includes: and controlling to input a plurality of specified pulse signals to a switching device of the totem-column PFC circuit within a specified duration of a second type period so as to reduce the bus voltage provided by the control circuit, wherein the ending time of the second type period is the starting time of the first type period.
In the technical scheme, a plurality of specified pulse signals are input to a switching device of the totem-pole PFC circuit to reduce the bus voltage provided by the control circuit, so that the bus voltage loss, the switching loss and the harmonic wave are further reduced.
In the above technical solution, the method further comprises: detecting an operating parameter of a load and resolving the operating parameter to determine a back electromotive force and a rotation speed of the load; and determining the load according to the back electromotive force and the rotating speed.
According to the technical scheme, the back electromotive force and the rotating speed of the load are determined by detecting the operating parameters of the load and analyzing the operating parameters, and finally the load capacity is determined according to the back electromotive force and the rotating speed, so that the electric quantity and the bus voltage value required by the load operation are comprehensively determined, and the reliability of the load operation is ensured.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (16)
1. A control method is suitable for a control circuit, and is characterized in that a PFC circuit is arranged in the control circuit, and a switching device is arranged in the PFC circuit, and the control method comprises the following steps:
controlling the switching device to continuously input a variable-frequency high-frequency pulse signal in a first type period so as to increase the bus voltage provided by the control circuit;
controlling to input a plurality of specified pulse signals to the switching device within a specified duration of a second type of period to reduce the bus voltage provided by the control circuit;
detecting the bus voltage and judging the current working state;
if the current circuit state is judged to be a variable high-frequency working state, judging whether the starting time length is greater than a given value t1, and if the starting time length is greater than the given value t1, switching the PFC into a multi-pulse part switching state;
and if the current circuit state is judged to be the multi-pulse part switching state, judging whether the starting time length is greater than a given value t2, and if the starting time length is judged to be less than or equal to the given value t2, switching the PFC to be in a variable high-frequency working state at the zero crossing point of the alternating-current voltage.
2. The control method according to claim 1, characterized by further comprising:
acquiring the load amount driven by the control circuit;
and determining the first type time interval and/or the second type time interval according to the load amount.
3. The control method according to claim 1, characterized by further comprising:
acquiring the load amount driven by the control circuit;
and determining at least one parameter of the frequency, the duty ratio and the pulse width of the high-frequency pulse signal according to the load amount.
4. The control method according to claim 1,
acquiring the load amount driven by the control circuit;
and determining at least one parameter of the number, the duty ratio and the pulse width of the specified pulse signals according to the load amount.
5. The control method according to any one of claims 1 to 4,
the time difference between the ending time of the first type time interval and the starting time of the second type time interval is less than or equal to a first preset time length,
the time difference between the starting time of the first type time interval and the ending time of the second type time interval is less than or equal to a second preset time length.
6. The control method according to any one of claims 1 to 4,
the first type time interval and the second type time interval are alternately arranged and do not coincide with each other.
7. The control method according to any one of claims 2 to 4, characterized by further comprising:
determining a third bus voltage given value according to the load;
acquiring the bus voltage when the control circuit supplies power;
judging whether the bus voltage is greater than or equal to the third bus voltage given value or not;
and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling a switching device in the PFC circuit to cut off or synchronously rectify so as to enable the PFC circuit to be in an intermittent state.
8. The control method according to any one of claims 1 to 4, wherein the PFC circuit is a boost PFC circuit, a power conversion device is arranged between the boost PFC circuit and a power grid system to which an AC signal is input, and a variable-frequency high-frequency pulse signal is controlled to be continuously input to the switching device in a first class period so as to increase a bus voltage provided by the control circuit, and the method specifically comprises the following steps:
controlling the switching device of the boost PFC circuit to continuously input the variable-frequency high-frequency pulse signal in a first type period so as to increase the bus voltage provided by the control circuit,
wherein the ending time of the first type time interval is the starting time of the second type time interval.
9. The control method according to any one of claims 1 to 4, wherein the PFC circuit is a boost PFC circuit, a power conversion device is arranged between the boost PFC circuit and a power grid system to which an AC signal is input, and a plurality of specified pulse signals are controlled to be input to the switching device within a specified duration of the second type of period so as to reduce a bus voltage provided by the control circuit, and the method specifically comprises the following steps:
controlling the input of a plurality of specified pulse signals to the switching device of the boost PFC circuit to reduce the bus voltage provided by the control circuit for a specified duration of the second type of period,
wherein the ending time of the second type time interval is the starting time of the first type time interval.
10. The control method according to any one of claims 1 to 4, wherein the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, the switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse-biased diode, the totem-pole PFC circuit is connected to a power grid system of an alternating-current signal, and in a first-class period, the control method controls continuous input of a variable-frequency high-frequency pulse signal to the switching device so as to increase a bus voltage provided by the control circuit, and specifically includes:
controlling the switching device of the totem-pole PFC circuit to continuously input the variable-frequency high-frequency pulse signal in a first class period so as to increase the bus voltage provided by the control circuit,
wherein the ending time of the first type time interval is the starting time of the second type time interval.
11. The control method according to any one of claims 1 to 4, wherein the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, the switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse-biased diode, the totem-pole PFC circuit is connected to a power grid system of an alternating-current signal, and in a specified duration of a second-type period, the control method controls input of a plurality of specified pulse signals to the switching device so as to reduce a bus voltage provided by the control circuit, and specifically includes:
controlling to input a plurality of specified pulse signals to a switching device of the totem-column PFC circuit within a specified duration of a second type of period to reduce a bus voltage provided by the control circuit,
wherein the ending time of the second type time interval is the starting time of the first type time interval.
12. The control method according to any one of claims 2 to 4, characterized by further comprising:
detecting an operating parameter of a load and resolving the operating parameter to determine a back electromotive force and a rotation speed of the load;
and determining the load according to the back electromotive force and the rotating speed.
13. A control apparatus comprising a processor, wherein the processor when executing a computer program implements:
the steps of the control method according to any one of claims 1 to 12.
14. An appliance, comprising:
a load;
the control device of claim 13;
the control circuit is controlled by the control device and provided with a PFC circuit, and the PFC circuit comprises at least one switching device which is configured to control a power supply signal to supply power to a load.
15. The home device of claim 14,
the household appliance comprises at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector and a computer host.
16. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed, implements the steps of the control method according to any one of claims 1 to 12.
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| CN1853334A (en) * | 2003-11-12 | 2006-10-25 | 崇贸科技股份有限公司 | PFC-PWM controller having interleaved switching |
| CN202565159U (en) * | 2012-05-24 | 2012-11-28 | 珠海格力电器股份有限公司 | PFC control circuit capable of flexibly boosting voltage |
| CN110138212A (en) * | 2019-06-01 | 2019-08-16 | 深圳市永航新能源技术有限公司 | Half-bridge driven no dead-time control method, control device and charging equipment |
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| US7391630B2 (en) * | 2003-10-24 | 2008-06-24 | Pf1, Inc. | Method and system for power factor correction using constant pulse proportional current |
| US9112425B2 (en) * | 2013-06-14 | 2015-08-18 | Power Integrations, Inc. | Switch mode power converter having burst mode with current offset |
| CN106712528B (en) * | 2017-01-10 | 2018-11-20 | 上海蔚来汽车有限公司 | LLC resonant converter driving pulse number modulator approach and unit |
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| CN1853334A (en) * | 2003-11-12 | 2006-10-25 | 崇贸科技股份有限公司 | PFC-PWM controller having interleaved switching |
| CN202565159U (en) * | 2012-05-24 | 2012-11-28 | 珠海格力电器股份有限公司 | PFC control circuit capable of flexibly boosting voltage |
| CN110138212A (en) * | 2019-06-01 | 2019-08-16 | 深圳市永航新能源技术有限公司 | Half-bridge driven no dead-time control method, control device and charging equipment |
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